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23 October 2018 The analysis and comparison of cross-correlation and phase demodulation methods in an OFDR system for strain/temperature sensing
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Abstract
As a kind of distributed optical fiber sensor, Optical Frequency-Domain Reflectometry (OFDR) can realize high spatial resolution distributed strain/temperature measurement. A method of measuring Rayleigh backscatter spectrum shift by cross-correlation calculation is widely adopted in OFDR sensor system. The other approach is based on the phase shift induced by the strain/temperature variation. In this paper, we propose a digital demodulation method to achieve it. Firstly the output of the photon detector is Fourier transformed and the phase information is obtained. The cross-correlation method and phase demodulation method are compared based on the theoretical and numerical analysis. The result shows that the spatial resolution (SR) of strain/temperature sensing is decided by the sweep range of the tunable laser source, while this parameter is much larger in traditional scheme. However, better stability can be achieved in cross-correlation scheme for sharp varying strain/temperature.
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Mengmeng Zhao, Guojie Tu, Benli Yu, and Jiping Lin "The analysis and comparison of cross-correlation and phase demodulation methods in an OFDR system for strain/temperature sensing", Proc. SPIE 10821, Advanced Sensor Systems and Applications VIII, 1082125 (23 October 2018); https://doi.org/10.1117/12.2502715
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